Why Cosmonauts Pee on the Bus That Picks Them Up for Launches

NASA astronaut Serena Aunon-Chancellor gestures from inside a bus before the launch of the Soyuz MS-09 spacecraft at the Russian-leased Baikonur cosmodrome on June 6, 2018.
NASA astronaut Serena Aunon-Chancellor gestures from inside a bus before the launch of the Soyuz MS-09 spacecraft at the Russian-leased Baikonur cosmodrome on June 6, 2018.
(Image credit: Vyacheslav OSELEDKO/AFP)

The three-person Expedition 56/57 crew launched into space from the Baikonur Cosmodrome in Kazakhstan this morning (June 6). On their way to the rocket, the crew — or at least Russian cosmonaut Sergey Prokopyev — did something odd: Reportedly, as in the past, the bus transporting them would stop, and the male crewmembers will urinate on the back-right tire of their ride.

(Apparently, female crewmembers splash urine from a cup onto the wheel.)

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Elizabeth Howell
Live Science Contributor

Elizabeth Howell was staff reporter at Space.com between 2022 and 2024 and a regular contributor to Live Science and Space.com between 2012 and 2022. Elizabeth's reporting includes multiple exclusives with the White House, speaking several times with the International Space Station, witnessing five human spaceflight launches on two continents, flying parabolic, working inside a spacesuit, and participating in a simulated Mars mission. Her latest book, "Why Am I Taller?" (ECW Press, 2022) is co-written with astronaut Dave Williams.